問題詳情
(3)Stretching a non-linear spring requires an amount of Work given by the equation U = 22x² – 9x³, where U is in Joules and x is in meters. How much force is required to hold this spring stretched out 4.0 m from equilibrium position?
(A)256 N
(B)246 N
(C)278 N
(D)212 N
(E)298 N
參考答案
答案：A
統計：A:0,B:0,C:0,D:0,E:0
難度：計算中